Cream shortening, sugar, eggs, and flavors in a bowl. In another bowl make a paste of cocoa and food coloring. Add to first mixture. Alternately add flour and buttermilk. Mix baking soda and vinegar in small bowl; add to batter. Blend. Bake in three 9" or 10" pans for 20 - 25 minutes at 350 F. Let cool completely.

For the frosting, blend all the ingredients until smooth. Cover the cake with the frosting.